Surfacing-machine



A.E. CHAPPELL. SURFACING MACHINE.

APPLICATION FILED OCT. 3| i918.

' Patented Aug. 30, 1921;

2 SHEETS-SHEET I.

A. E. CHAPPELL. SURFACING MACHINE.

APPLICATION FILED OCT. 3. 191B.

Patented Aug. 30,- 1921.

2 SHEETS-SHEET 2.

, w m fiul m UNITED STATES PATENT oFFlcE.

Application filed October a, 1918. Serial no. 280,672. a

To all whom it may concern Be it known that I, ARTHUR E. CHAPPELL,

a citizen of the United- States, residin at Chicago, in the county ofCook and tate of Illinois, have invented certain new and usefulImprovements in Surfacing-Machines, of which-the following is aspecifi-- provide an improved means for locking the cation.

This invention relates'to floor dressing or surfacing machines which areemployedfor the purpose of producing a smooth surface onf10ors,bowlingalleys, etc., and aims to provide a manually operatedpower driven machine ofthis character which will be simple' and compactin construction, and at the same time strong and durable, and which willreadily. permit of the various adjustments of the surfacing tool whichare required in order to obtain the most satisfactoryresultsa In thesemachines it is essential that the surfac'ing'tool, which isusually anemery covered cylinder or drum, be so mounted that it may be accuratelyadjusted toperfect parallelism with the floor. This has usually beendone. by making the bearings of the tool adjustable on and relatively tothe frame of the machine. In my present invention these bearings arerigid with the machine frame, andone object of the present invention isto-provide a simple and im- 4 proved means for adjusting the sides ofthe machine frame vertically relatively to its supporting axle. p

In machines of this kind it has also heretofore been customary to mountthe shaft of the surfacing tool in a bearing located at a greater orless distance from one end of the I .tool, and this produces anundesirable lateral vibration or shake in the shaft which is bothannoying to the operator and impairs the efliciency of the tool and theaccuracy of its work. Another object of the present invention,therefore, is "to ellminate these faults which I accomplish by providingan elongated shaft support having spaced bear:

ings, and a surfacing drum having. an inset head at the end next to theshaft support so that that end of the working surface of the 'drumconsiderably-overhangs the adjacent bearing? Another objectof myinvention is to provide a machine with a reverslble surfacing cylinderand a removable shaft, the shaft being removable from the bearingsandthe cylinder being detachable from the shaft so that the. cylinder maybe reversed in position or another cylinder may be substituted withoutchanging the shaft, or another shaft may be substituted without changingthe cylinder. a

A further object of the invention is to .drum shaft in its bearings atthe end of the shaft support opposite that at which the drum is applied,and for keying the'drum on the shaft. as well" as taking up wear andpreventing end play of the shaft or the drum on. the shaft: at the sametime making it easy'to transfer, the drum and shaft to the opposite sideofthe machine frame, when requlred, for the purpose ofo6casionallyreaching portions of the floor not. accessible to the druminits regularor normal position. j

Still another object of the invention is to provide an improved dampenerfor a handle-pole or shank which carries the handlebar, designed tocushion and absorb the vibrations of the frame created by the surfacingtool and prevent their transmission to the handle. This is especiallyuseful and desirable in a machine, such as that of the present inventionwherein the driving shaft of the surfacing tool is j ournaled in thebearin s that are rigid with the machine frame.

hese and other objects and advantages of the invention will be betterappreciated as the same is morefully understood from the followingdescription when considered in connection with the accompanyingdrawings, wherein -I have shown one practical and workable embodiment ofthe invention, and in which,' p

Figure 1 isa side elevation of my improved surfacing machine;

Fig. 2 is a substantiall vertical section taken on the line22 of ig. 1,this figure also showing in dotted lines the reversed positionof thesurfacing drum and its shaft relatively to the machine frame;

Fig. 3 is, a substantiall vertical section taken on the line 3-3.0f ig;1

Fig. 4 is an enlarged fragmeiitary detail 7 end of the frames'upcporting s aft in one ole of the handle against vibrations of therame. i Y

Referring to the drawings, the frame of the machine comprises a topplate 6, substantially vertical parallel side plates 7 and 8, the formerof which extends some distance in advance of the latter, and a narrowfront wall 9,-this latter terminating at its lower end in an elongatedhub 10 which sup orts the bearings ofthe shaft. of the 'sur acin tool.This frame is supported substantially midway of its ends on a twowheeltruck comprising an. axle 11 and a pa r of wheels 12 journaled onopposite ends of said axle. As shown in Figs. 3 and 4, the axle. 11 ismounted at one end in an opening 13 formed in the side wall ,7 near 7its lower end; and at its other end said 8. The

or closed end of the notch '14. By turning the screw 16, the side 8 ofthe frame is side 7 and a lock nut 17 is referab y pro-. vided on thescrew 16 to c eck accidental of the screw in the shaft. Extendraised orlowered relatively to. the o posite turning 111g through thehnb 10 andsupported by anti-friction bearings 18 in each end of the latter. 1s ashaft 19, on which is mounted a' surfacm drum or tool 20. Preferably theouter en of the shaft 19 is provided with a-head .or cap 21 carryin apin or keg 0 'the drum to lock the latter non-rotatably on,. -;theshaft. The opposite head of the has a central inset portion 23 thatoverhangs the adjacent end of the shaft supploirting hub 10, thusbringing the anticti'on bearing 18 at that end of the shaft I ."supportwell within and between the ends of the drum. By thus causing the drumto overhang the adjacent bearing of its T shaft, the lateral vibrationor' shake of the shaft and drum is atly reduced as comsared wlth theusua mounting wherein the rum lies at a greater or less distancebeyondthe bearing.

The opposite end'of the shaft 19 'projects'beyond the other bearing andcarries thereof: a sprocket wheel 24. detachably locked to the shaft'bya set screw 20 or other preferred means. Be end the hub of the sprocketwheel there s fitted on the projectin end of the shaft a sleeve 25, the1nner en of the sprocket hub while its outer end projects sllghtlybeyond the end of the shaft,

gs shown in Fig. 2. The outer end of sleeve 5' is covered by a disk 26through which passes a screw 27 engggiilif m the end of the she y ofwhich abuts against the end a tapped hole tightening up. r

the screw 27, the shaft 19 is locked securely in its bearings and alsoadjusted to take up any e'nd play of the shaft or of the drum on theshaft resulting from wear. To prevent accidental disengagement of thescrew 27, the disk 26 is 100 ed to the shaft so as to rotate with thelatter by a locking pin 28 passing through said disk and into the end ofthe shaft.- This construction also locks the s rocket wheel 24 againstaccidental disp acement longitudinally of the shaft 19. u

In case it is desired to transfer the surfacing drum to the oppositeside of the machine, it is necessary only to back out thescrew' 27,withdraw the shaft 19 endwise from its bearings and from the drum 20,transfer the drum 20 without inverting it, to the opposite side of themachine frames, insert the shaft 19, turned end for end, and secure itsprojectin end by the means already described. or looking the shaft inthis chan ed position, the inset end 23 is provided wit a hole 29 thatis engaged b the locking pin 22, as illustrated in the otted lineposition of' the parts shown in Fig. 2.

Journaled in and between the side walls 7 and 8 above theshaft 11 is afanshaft 30 (Fig. 3) e uipped at one end with a sprocket wheel 31. eyedon this shaft is a centrifual' fan 32 housed within a sheet metalcasthedrum on mg 33, this latter having in one side wall thereof a suctionopening or inlet 34 that communicates with a' conical induction passageformed by a sheet metalcasing 35 extending between the inner side of thefan illustrated at 37, the armature shaft of which carries. a sprocketwheel 38. A

-sprocket chain 39 trained around the sprocket wheels 38, 31 and 24serves to drive both the surfacing tool and the fan at proper relative sThe e or-shaft carryi the handle by which t e machine is contro led anddirected over the floor surface, comprises, as here- 'in shown a lowersection 40 having a forked lower end 11, and anupper section 42 securedto the lower section b screws 43," and carrying at its upper end t etransverse handle 44. Onthe section 42 of the pole is mounted acontroller 45 for the electric motor, which controller may be of anydesired or make, and has nothing todo with cut invention.

Where, as in the present case, the bearings a proved the pres-.

that is secured on the truck shaft of the drum shaft are rigid with themachine frame, the vibrations of the drum and its shaft are, of course,transmitted to the frame and from the latter to the pole and handle. Myinvention includes a simple de-' vice by which the manual propulsion andguidance of the machine are rendered easier on the operator bycushioning or absorbing the machine frame Vibration. This device isshown principally in the detailed view Fig. 5 wherein 46 designates abracket plate secured to and beneath the rear edge of the top frameplate 6, and 47 designates a metal strap or yoke secured to and oppositethe plate 46. Between the members 46 and 47 are cushions 48 of felt orlike yieldable material, between which passes the pole piece 40. Aclamping screw 49 threaded through the yoke 47 engages a thin backer orshim 50 by which the cushions 48 are tightly compressed on the shank orpole 40. By this construction the pole and handle are secured to themachine frame with sufficient rigidity for propulsion and guidancepurposes, and at the same time the pole and handle are effectivelycushioned against the vibrations, which are practically all absorbed bythe cushions 48.

Depending from'the underside of the pole member 4:0 is a leg or standard51 (Fig. l) by which the machine may be supported with the surfacingtool off the floor when not at work in an obvious manner. To the forwardedge of the top plate f the frame is attached, by thumb screws 52, aguard or cover '53 that extends down over the forward or advance side ofthe surfacing cylinder. The'purpose of this guard isto prevent the dustand other material loosened by the surfacing tool from being thrownforwardly of the machine, and to assist the action of the fan in drawingthe dust through the machine into the dust receptacle or catcher. Ahandle 54 is provided at the front of the machine by which it may belifted when necessary.

It is believed that the construction and operation of my invention willbe readily understood from the foregoing without further description,and it should be obvious that I have rovided a floor dressing machinewhich. is extremely simple and compact in construction, in which thesurfacing tool may be readily adjusted to perfect parallelism with thefloor and may'readily be transferred to the opposite side of the machinewhen necessary or desirable, in which the vibrations of the machine areeffectually cushioned and prevented from reaching the operating handleto any serious extent, and in which all of the parts can be economicallymade and readily assembled.

The invention, however, is not limited to the structural details shownand described tures differing widely in mechanical detail from thoseemployed herein for purposes of illustration merely.

I claim:

1. In a surfacing machine, the combination of a frame havingsubstantially vertical side members, one of said members being formedwith a shaft-receiving opening near its lower edge and the other with ashaft-receiving notch in its lower edge, a shaft mounted in said openingand notch, an adjusting screwthreaded through said shaft and abuttingagainst the top of said notch, wheels on the ends of said axle, and asurfacing tool carried by said frame.

2. In a surfacing machine, the combination of a frame provided with anelongated bearing, a shaft journaled therein, a surfacing cylinderhaving spaced end walls adapted to receive said shaft, one of said endwalls being spaced inwardly from the end of the cylinder to dispose saidend around said bearing, means for locking said cylinder againstrotation relatively to said shaft, means for rotating said shaft, andmeans for retaining said shaft in its bearing.

3. In a surfacing machin'e, the combination of a frame having a narrowprojecting portion provided with an elongated bearing extendinglaterally beyond said portion, a shaft reversibly journaled in saidbearing and provided at one end with a locking pin, a surfacing cylindermounted upon one end of said shaft and locked thereto by said pin, saidcylinder'overlapping and surrounding the extended end of said bearing,means at the other end of said shaft for preventing displacement of theshaft from its bearing and for regulating the end play of said shaft inits bearing and a sprocket wheel mounted on said shaft.

v 4. In a surfacing machine, the combination of a frame provided with anelongated bearing, a shaft, a surfacing cylinder reversibly mountedthereon and adapted in one position to overlap one end of said bearing,means for locking said shaft in the bearing, and detachable'means fordriving said shaft, said driving means being removable to permit endwisereversal of the shaft so that said cylinder may be disposed at will uponeither side of thev bearing and reversed endwise upon the shaft 5. In asurfacing machine, the combination of a frame, a shaft-support carriedby said frame, a shaft j ournaled in and projecting at its ends beyondthe ends of said shaft-support and carrying'a pin key, a surfacing drumformed with a hole and mounted on one projecting end of said shaft, andmeans on the other projecting end of said shaft for drawing said shaftendwise to key it to said drum- 6. In a surfacing machine,the'combination of a frame, a shaft-support carried by said frame, ashaft journaled in and projecting at its ends beyond the ends of saidshaft-support and carrying a pin, a surfacing drum formed with a holefor said pin and mounted on one Erojecting endof said shaft, a drivingmemer fast on the other projecting end of said shaft, a sleeve mountedon said last-named shaft-end, said sleeve abutting at its inner endagainst the hub of said driving member and at its outer end extendingbeyond said last-named shaft-end, a disk bearing against the outer endof said sleeve, and an adjusting and lockin screw passing through saiddisk and tapped into said last-named shaft-end.

7 In a surfacing machine, the combination of a frame having a narrowforwardly extending portion terminating in a horizontal bearingprojecting laterally in opposite directions beyond said portion, asurfacin cylinder having a diametral wall at one end and an inwardlyrecessed wall at the o posite end adapted to receive and surround theprojecting end of said bearing, a shaft j ournaled in said bearing andpro ecting outwardly therefrom at each end, means carried by one end ofsaid shaft for detachably engaging with either end wall of said cylinderto lock said cylinder against rotation on the shaft, a

driving wheel mounted on the other projecting end of said shaft, andmeans carried by said end of the shaft for locking said wheel againstdisplacement and for taking up end play in the shaft, said shaft beingreversible in said bearing and said cylinder being reversible on saidshaft.

ARTHUR E. CHAPPELL.

